reg:RQP-DEF-0360-SQL cannot be generated error

[katdbc]

I am having a report with set of filters and  when i try to add an extra filter and run the report,it throws me an RQP-DEF-0360-SQL cannot be generated error.Since Im just 4 months old with cognos,i havent comee up with this error in my past.Can any body throw some insight.Thanks in advance.

I have also attached the error message